This paper designs and realizes an privilege control component based on LAMP（Linux、Apache、 MySQL、PHP）

which uses Role-Based Access Control（RBAC）model

to realize the privilege authentication control of Web applications.The component includes privilege management module

role management module and privilege authentication module

and the core of the entire component is the privilege authentication module

which devide the privilege into operation privilege and resource privilege.It is not only a good way to avoid the rapid expansion of the permissions table

but also makes the authentication process more simple and efficient.